xmlwriter_set_indent($xw, 1);
$res = xmlwriter_set_indent_string($xw, ' ');
-xmlwriter_start_document($xw, '1.0', 'utf8');
+xmlwriter_start_document($xw, '1.0', 'UTF-8');
// A first element
xmlwriter_start_element($xw, 'tag1');
xmlwriter_set_indent($xw, 1);
$res = xmlwriter_set_indent_string($xw, ' ');
-xmlwriter_start_document($xw, '1.0', 'utf8');
+xmlwriter_start_document($xw, '1.0', 'UTF-8');
// A first element
xmlwriter_start_element($xw, 'tag1');
xmlwriter_set_indent($xw, 1);
$res = xmlwriter_set_indent_string($xw, ' ');
-xmlwriter_start_document($xw, '1.0', 'utf8');
+xmlwriter_start_document($xw, '1.0', 'UTF-8');
// A first element
xmlwriter_start_element_ns($xw,'prefix', 'books', 'uri');
xmlwriter_start_attribute($xw, 'isbn');